# DBe

**Formula:**BeD**Molecular weight:**11.026284**Information on this page:****Options:**

## Constants of diatomic molecules

**Go To:** Top, References, Notes

**
Data compilation copyright
by the U.S. Secretary of Commerce on behalf of the U.S.A.
All rights reserved.
**

**Data compiled by:** Klaus P. Huber and Gerhard H. Herzberg

Data collected through September, 1976

Symbol | Meaning |
---|---|

State | electronic state and / or symmetry symbol |

T_{e} | minimum electronic energy (cm^{-1}) |

ω_{e} | vibrational constant – first term (cm^{-1}) |

ω_{e}x_{e} | vibrational constant – second term (cm^{-1}) |

ω_{e}y_{e} | vibrational constant – third term (cm^{-1}) |

B_{e} | rotational constant in equilibrium position (cm^{-1}) |

α_{e} | rotational constant – first term (cm^{-1}) |

γ_{e} | rotation-vibration interaction constant (cm^{-1}) |

D_{e} | centrifugal distortion constant (cm^{-1}) |

β_{e} | rotational constant – first term, centrifugal force (cm^{-1}) |

r_{e} | internuclear distance (Å) |

Trans. | observed transition(s) corresponding to electronic state |

ν_{00} | position of 0-0 band (units noted in table) |

State | T_{e} | _{e} | _{e}x_{e} | _{e}y_{e} | B_{e} | _{e} | _{e} | D_{e} | _{e} | r_{e} | Trans. | _{00} |
---|---|---|---|---|---|---|---|---|---|---|---|---|

G ^{2} | 58750 | 302.5 Z | 23.6 | [2.747] 1 2 | [10E-4] 3 | [1.931] | G X R | 58134.9 Z | ||||

↳Colin and De Greef, 1975 | ||||||||||||

F ^{2}^{+} | (56606) | (1598) 4 | [5.879] | [3.01E-4] 3 | [1.3198] | F X | 56644.87 Z | |||||

↳Colin and De Greef, 1975 | ||||||||||||

E' (^{2}^{+}) | [54230] 5 | [5.260] 5 | [1.395] 5 | E' X | 50533.8 5 Z | |||||||

↳Colin and De Greef, 1975 | ||||||||||||

E ^{2}^{+} | (54135) | (1460) 4 | [5.745] 6 | [3.8E-4] | [1.335] | E X | 54104.9 Z | |||||

↳Colin and De Greef, 1975 | ||||||||||||

State | T_{e} | _{e} | _{e}x_{e} | _{e}y_{e} | B_{e} | _{e} | _{e} | D_{e} | _{e} | r_{e} | Trans. | _{00} |

D ^{2}^{+}, ^{2}, ^{2} | (54000) 7 | D X | 54050 | |||||||||

↳Colin and De Greef, 1975 | ||||||||||||

B ^{2} | 50906 | 1646.22 Z | 25.15 8 | 5.9963 9 10 | 0.1217 11 | -0.0089 | [3.11E-4] 12 | 1.3068 | B X V | 50963.02 Z | ||

↳Colin and De Greef, 1975 | ||||||||||||

A ^{2}_{r} | 20036.11 13 | 1551.13 Z | 23.00 | 5.7614 14 | 0.1344 | -0.0003 | 3.181E-4 15 | -0.0000022 | 1.3332 | A X V | 20045.91 16 Z | |

↳missing citation; Horne and Colin, 1972 | ||||||||||||

X ^{2}^{+} | 0 | 1530.32 Z | 20.71 | 5.6872 | 0.1225 | -0.001 | 3.138E-4 | 1.3419 |

### Notes

1 | Average from P,R and Q branches.
Transitions to v'=1 and 2 consist of Q branches only, strongly perturbed for v'=2.
The Q branch constants are given by B'v = 2.197 + 1.205(v+1/2) - 0.167(v+1/2)^{2}. |

2 | See BeH note d. |

3 | Additional D_{v} and higher order constants in Colin and De Greef, 1975. |

4 | Using isotope relations. |

5 | Unidentified single level, vibrational numbering unknown. In absorption from v"=2. |

6 | See BeH note i. |

7 | Strong absorption, complex structure. |

8 | Inclusion of v=3 changes these constants to _{e} = 1607.29, _{e}x_{e} = -5.32,
_{e}y_{e} = -6.77.
. |

9 | -type doubling, v_{ef}(v=0) = +0.074*N(N+l). |

10 | See BeH notes d and l. |

11 | (v2); recalculated from Colin and De Greef, 1975. |

12 | For additional D_{v} and higher order constants see Horne and Colin, 1972. |

13 | See BeH note n. A ~ +1.9. |

14 | -type doubling, v_{ef}(v=0) = +0.004l9*N(N+l) -...; additional constants in Horne and Colin, 1972. |

15 | Higher order constants in Horne and Colin, 1972. |

16 | Pure vibronic energy difference, not to be confused with the band origin as usually defined in these tables. See Horne and Colin, 1972. |

17 | From the value for BeH. |

## References

**Go To:** Top, Constants of diatomic molecules, Notes

**
Data compilation copyright
by the U.S. Secretary of Commerce on behalf of the U.S.A.
All rights reserved.
**

**Colin and De Greef, 1975**

Colin, R.; De Greef, D.,
*The absorption spectrum of the BeH and BeD molecules in the vacuum ultraviolet*,
**Can. J. Phys.**, 1975, 53, 2142. [all data]

**Horne and Colin, 1972**

Horne, R.; Colin, R.,
*The A ^{2}«PI»-X^{2}«SIGMA»^{+} band system of BeH and BeD in absorption*,

**Bull. Soc. Chim. Belg.**, 1972, 81, 93. [all data]

## Notes

**Go To:** Top, Constants of diatomic molecules, References

- Data from NIST Standard Reference Database 69:
*NIST Chemistry WebBook* - The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.